Use this window and tab to define which parts from the physical structure (the serial structure template) go into which parts of the functional structure. Here, each structure position in the serial structure template can be connected to one or more product functions.
You can select the right mouse button option Set as Primary Function to set a function as the primary function. Only one function per structure position can be defined as a primary function. The primary function is automatically suggested as the default function breakdown when you register a fault on a serial in the particular structure position.